/Engine/Plugins/Runtime/DataRegistry/Source/DataRegistry/Public/DataRegistry.h
Fills in a list of all item ids provided by this registry, sorted for display
virtual void GetPossibleRegistryIds ( [TArray](API\Runtime\Core\Containers\TArray)< [FDataRegistryId](API\Plugins\DataRegistry\FDataRegistryId) > & OutRegistryIds, bool bSortForDisplay ) const